NeoTrace is a really cool
Windows program (trial version available at WWW.NEOTRACE.COM) which, when given an
IP address or
domain name, will plot graphically on a world map the
route that internet data packets have taken to get from you to them, as well as all available information about the various machines along the path.
It is invaluable for finding out all sorts of interesting geographical information about the net, other users, web servers, and so on. Combines many of the features of a Reverse DNS search, a Whois lookup, a TraceRoute command, and more..